Author Topic: Kikusui oscilloscope  (Read 1245 times)

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Offline RobertPPPTopic starter

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Kikusui oscilloscope
« on: June 14, 2024, 02:37:10 pm »
Hi, I found Kikusui 7202a oscilloscope for under 90$. I wonder if this is a good offer. It is untested and it has crack on display. Does it have some kind of protection glass or is it broken tube? Overall seller has good ratings.
 

Offline tv84

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Re: Kikusui oscilloscope
« Reply #1 on: June 14, 2024, 02:48:44 pm »
My donations go to UNICEF...
 

Offline Gyro

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Re: Kikusui oscilloscope
« Reply #2 on: June 14, 2024, 04:01:54 pm »
Hi, I found Kikusui 7202a oscilloscope for under 90$. I wonder if this is a good offer. It is untested and it has crack on display. Does it have some kind of protection glass or is it broken tube? Overall seller has good ratings.

Walk away!
Best Regards, Chris
 

Offline axantas

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Re: Kikusui oscilloscope
« Reply #3 on: June 14, 2024, 04:04:14 pm »
The tube ist broken.
 

Online Aldo22

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Re: Kikusui oscilloscope
« Reply #4 on: June 14, 2024, 04:13:22 pm »
The tube ist broken.

I think it's a protective glass.
It doesn't seem to be unusual for it to break.
Here, for example, you can clearly see that the tube is behind it.
https://www.aef.se/Matteknik/Matteknikportal/Bildportaler/Bildportal_G-L/Detaljer/Kiku_497/Kikusui_497.htm

But I still wouldn't buy it.
 
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Offline RobertPPPTopic starter

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Re: Kikusui oscilloscope
« Reply #5 on: June 14, 2024, 04:26:09 pm »
Oh thank you very much, yeah I see. Unfortunately even shity analog scopes in my country are selling for 100$.
 

Offline G-son

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Re: Kikusui oscilloscope
« Reply #6 on: June 14, 2024, 05:03:58 pm »
Must be what, 25 years old? For an analog scope that may not worry me so much, for a digital one there may be things like backup batteries for calibration data about to give up and huge issues to get it working again when they finally fail.
 

Offline coromonadalix

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Re: Kikusui oscilloscope
« Reply #7 on: June 14, 2024, 05:23:15 pm »
well    i would say  any of theses crt scopes,  if you dont sse it working  in person or thru some videos,   don't get near that

i understand  finances may get difficult,  but  if you want to do some work, serious or not,  you will need to invest at one time.


the crack is the graticule markings window / bezel
 

Offline TomKatt

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Re: Kikusui oscilloscope
« Reply #8 on: June 14, 2024, 05:48:24 pm »
Even $90 is close to 25% of a really nice brand new DSO with much greater capabilities.  While older equipment is often easier to repair, they are still complex devices requiring calibration and occasionally have components that are no longer available.  Additionally, CRT circuits run at extremely high voltages that can be lethal if you don't have experience working on them.

Tempting as it may be, I'd only suggest old CRO gear to beginners if the price is very cheap AND the gear has proven to be in good working order.  If you have ANY doubts as to it's operational status, I'd avoid at all costs.
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Offline le_yum

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Re: Kikusui oscilloscope
« Reply #9 on: June 14, 2024, 06:26:04 pm »
Oh thank you very much, yeah I see. Unfortunately even shity analog scopes in my country are selling for 100$.

that is in your country :

https://www.eevblog.com/forum/buysellwanted/fs-(eu)-siglent-sds1102x-100mhz-2-channel-scope/
 

Offline coromonadalix

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Re: Kikusui oscilloscope
« Reply #10 on: June 14, 2024, 07:48:35 pm »
and the upgrade you can apply to this scope,  is really giving it more value than you paid ....
 

Offline BrokenYugo

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Re: Kikusui oscilloscope
« Reply #11 on: June 14, 2024, 07:59:35 pm »
A scope CRT is a fairly delicate precision device, even if the vacuum is not broken a hard drop/hit can damage internal structures and ruin it, bad CRT effectively scraps most analog scopes.

 

Online Wallace Gasiewicz

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Re: Kikusui oscilloscope
« Reply #12 on: June 14, 2024, 08:30:17 pm »
I would not buy this if I could not see it working.   
You could fix the graticule.   
But anything else is almost impossible to service on Japanese Scopes,  although they are very good machines, there is no chance to get any Service Manuals on any Japanese Scope that I am aware of.The Scope Tube is a traditional tube, not just a Monitor like we see on some old digital scopes. If it is damaged, scope is not worth anything.Looking at the pictures, it reminds me of my HP 1980 (Introduced in 1985) Scope, a kinda cross between an Analog and Digital, with very unusual parts that cannot be found.
By the way the Sigilent recommended is in Luxembourg. but it does sound like a decent deal.
 

Offline Gyro

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Re: Kikusui oscilloscope
« Reply #13 on: June 14, 2024, 08:43:11 pm »
Any half decent seller will at least power a scope up and show a picture of what happens - "untested" is not a good sign with that sort of visible damage. At least if it was showing something on the screen you would have some indication that, 1: the CRT vacuum is still intact and 2: that the deflection plates are possibly not distorted (although that would require both X and Y deflection being visible).

Without that, again I would still say walk away. Paying $100 for some sort of functional scope in your country might or might not be good value. Paying $98 for something terminally broken definitely isn't.
Best Regards, Chris
 

Offline TomKatt

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Re: Kikusui oscilloscope
« Reply #14 on: June 14, 2024, 08:47:31 pm »
Scope crt tubes are precision components and shock can put them out of alignment even though they still work and show a trace.  A cracked case or graticle can be flags that the scope has been dropped, which can damage the internal electron gun assembly.
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Offline stj

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Re: Kikusui oscilloscope
« Reply #15 on: June 14, 2024, 09:19:53 pm »
as a Kikusui owner i'll give you some advice
dont buy any kikusui product unless it's working AND you can get a service manual FIRST.

btw, they use cheap crappy pots and rotary switches in their crt-based scopes :(
 
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